The Master Lock Number 646D Set Your Own Combination Padlock features a 13/16 in (20 mm) wide metal body for durability. The 1/8 in (3 mm) diameter shackle is 11/16 in (17 mm) long and made of steel, offering resistance to cutting and sawing. The 3 dial combination security offers keyless convenience. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.